An Introduction to XML Query Processing and Keyword Search by Jiaheng Lu

By Jiaheng Lu

"An advent to XML question Processing and key-phrase seek" systematically and comprehensively covers the most recent advances in XML facts looking out. It offers an intensive review of the present question processing and key-phrase seek recommendations on XML info, together with XML labeling schemes, indexing, processing on order and un-order XML tree styles, XML question optimization, effects estimation, and XML key-phrase searches, that are elaborated in separate chapters. Graduate scholars and researchers within the box of XML information looking out will locate this publication a useful source. Prof. Jiaheng Lu is an affiliate professor at Renmin collage of China’s university of Information.

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PM D round((PL C PR ) / 2)((PL C PR ) / 2); 2. if PL C 1 < PR then 3. codeArr[PM] D assignMiddleBinaryString(codeArr[PL], codeArr[PR]); 4. V-CDBS-SubEncoding(codeArr, PL , PM ); 5. V-CDBS-SubEncoding(coderArr, PM , PR ); 6. end V-CDBS-SubEncoding is a recursive procedure, the input of which is an array codeArr, the left position “PL ” and the right position “PR ” in array codeArr. 1), then it uses the new left and right positions to call the V-CDBS-SubEncoding procedure itself, until each (except 0) element of the array codeArr has a value.

8 shows V-CDBS-Prefix. Similarly we can apply V-CDBS to the prime labeling scheme to record the document order. , relationships, its query efficiency is quite bad. Therefore, we do not discuss in detail how V-CDBS is applied to prime. 6 CDQS Encoding The size of each V-CDBS code is stored with fixed length. If many nodes are inserted into the XML tree, the size of the length field is not enough for the new labels; then we have to relabel all the existing nodes. Even if we increase the size of the length field to a larger number, it still cannot completely avoid relabeling, and it will waste the storage space.

We show that F is one-to-one using the same notation and a symmetrical argument. If F(t) D F(u), by construction we know that Td (l) D Td (m). l and m are therefore both elements of Ld (l) and by definition of a strong DataGuides are also elements of Ls (l). Therefore, Ts (l) D Ts (m), that is, t D u. 38 3 XML Data Indexing 3. Finally, we see that the accuracy constraint of any DataGuides guarantees that F is onto. Any object in d must be reachable by some label path l that also exists (and therefore has a target set) in s.